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首页> 外文期刊>ISIJ international >Combined Effect of Ausforming and Warm Tempforming on the Strength and Toughness of An Ultra-High Strength Steel
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Combined Effect of Ausforming and Warm Tempforming on the Strength and Toughness of An Ultra-High Strength Steel

机译：奥氏体和热定形对超高强度钢强度和韧性的综合影响

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A 0.4C-2Cr-1Mo-2Ni steel (in mass%) was austenitized at 1123 K, followed by ausforming (AF) using multi-pass caliber rolling with a rolling reduction of 74%. The AF samples were subsequently tempered at 773 K and deformed by multi-pass caliber rolling (i.e. warm tempforming, WTF) with a rolling reduction of 46%. Their microstructures and mechanical properties were investigated and compared to those of the quenched and tempered samples (non-AF samples) which were subjected to the sequent WTF with rolling reductions of 46% and 74%. The WTF with rolling reductions ranging 46 to 74% resulted in the strengthening and toughening of the AF and non-AF samples through the evolution of anisotropic and ultrafine grain structures with strong //rolling direction (RD) fiber textures. The AF sample demonstrated the faster kinetics of the microstructural changes, i.e. refinement in the transverse grain size and development of highly elongated grains than the non-AF sample. As a result, the AF sample exhibited a better combination of ultra-high strength and toughness than the non-AF sample, when compared at the rolling reduction of 46%. The combined effect of AF and WTF was especially pronounced in the enhancement of toughness resulting from delamination.
机译：在1123 K下对0.4C-2Cr-1Mo-2Ni钢（质量％）进行奥氏体化，然后使用多道次口径轧制以74％的压下率进行奥氏体成形（AF）。随后将AF样品在773K下回火，并通过多道次口径轧制（即，温热成形，WTF）变形，轧制率降低46％。研究了它们的微观结构和力学性能，并将其与淬火和回火样品（非AF样品）的显微组织和力学性能进行了比较，这些样品经受了后续的WTF，轧制率分别为46％和74％。轧制减少率在46％到74％之间的WTF通过具有强轧制方向（RD）纤维织构的各向异性和超细晶粒结构的演变，导致了AF和非AF样品的增强和增韧。 AF样品表现出更快的微观结构变化动力学，即。与非AF样品相比，横向晶粒尺寸更细，高度拉长的晶粒发展。结果，当以46％的压下率进行比较时，AF样品表现出比非AF样品更好的超高强度和韧性的组合。 AF和WTF的组合作用在分层引起的韧性增强中特别显着。

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